Retinitis Pigmentosa - the collective term for a group of hereditary disorders that result in progressive loss of vision. Retinitis pigmentosa generally begins with diminished night vision, as the degeneration affects primarily the rods (photoreceptors responsible for vision in dim light and for peripheral vision). Eventually, the condition progresses to rods, and then cones, throughout the retina. In most people, symptoms begin between the ages of 10 and 30, with complete loss of vision by around age 40.
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